Sebaseoma
Özet
Sebaseoma, sebase hücreler yönüne diferansiyasyon gösteren, genellikle yüz ve skalp bölgesinde sarı-turuncu ya da ten renkli papül veya nodül olarak izlenen benign bir adneksiyal epitel tümörüdür. Kadınlarda erkeklere kıyasla daha sık görülen bu tümör, çoğunlukla altıncı ve dokuzuncu dekatlar arasında ortaya çıkmakla birlikte geniş bir yaş aralığında saptanabilmektedir. Klinik seyri benign olup rekürrens veya metastaz bildirilmemiştir; ancak Muir-Torre sendromu zemininde geliştiğinde multipl lezyonlar şeklinde prezente olabilmektedir. Histopatolojik olarak dermiste yerleşen ve yoğun eozinofilik bağ dokusuyla ayrılan organize olmamış bazaloid hücre ve matür sebosit nodüllerinden oluşur; sebase debri içeren kistik yapılar sıklıkla izlenir. Ayırıcı tanısında, düzenli lobuler arşitektür gösteren sebase adenom, infiltratif büyüme gösteren sebase karsinom ve fokal kıl kökü diferansiasyonu izlenen trikoblastom yer alır. Ayrıca sebase diferansiasyon gösteren bazal hücreli karsinomdan ayrımında histolojik ipuçlarının yanı sıra immünohistokimyasal çalışmalardan yararlanılır; sebaseomada EMA ve D2-40 pozitifliği saptanırken, bazal hücreli karsinomlarda Ber-EP4 ekspresyonu dikkat çeker. Sonuç olarak sebaseoma, kafa karıştırıcı bir terim olan sebase epiteliomanın yerini almış ve kendine özgü kriterleriyle klinik pratikte önemli bir yer edinmiştir.
Sebaceoma is a benign adnexal epithelial tumor differentiating toward sebaceous cells, typically presenting as a yellow-orange or skin-colored papule or nodule on the face and scalp. Exhibiting a strong female predominance, it is most frequently diagnosed between the sixth and ninth decades of life, though it spans a wide age range. While its clinical course is entirely benign without any reported recurrence or metastasis, it can present as multiple lesions when associated with Muir-Torre syndrome. Histopathologically, it is characterized by dermal, unorganized nodules composed of a mixture of basaloid cells and mature sebocytes separated by dense eosinophilic connective tissue, often containing cysts with sebaceous debris. The differential diagnosis primarily includes sebaceous adenoma, which features regular lobular architecture, infiltrative sebaceous carcinoma, and trichoblastoma with focal hair follicle differentiation. Distinguishing it from basal cell carcinoma with sebaceous differentiation relies on histopathological clues and immunohistochemical staining; sebaceoma typically exhibits EMA and D2-40 positivity, whereas basal cell carcinoma characteristically expresses Ber-EP4. Ultimately, the term sebaceoma successfully replaced the ambiguous concept of sebaceous epithelioma, establishing itself as a well-defined and highly useful diagnostic category.
Referanslar
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